The camera has two contacts, one for focus and one for shutter. Typically, the focus circuit needs to be closed before the shutter will trip (there is bound to be exceptions to this). A prerelease cord acts like half depressing on the shutter button, closing the focus circuit. In MF, you manually focus where you want. In AF-S, the focus is found and locks into place wherever it is pointed when the cord is engaged. In AF-C, the focus continuously updates, tripping the shutter when activated. Some cameras have a focus/release priority setting. In focus priority, focus must be aquired before the shutter trips. In release priority, it will make a best effort for focus, but trip the shutter even if not 100% locked. Depending on light levels and contrast, focus can take fractions of seconds to several seconds, if it is found at all. We recommend release priority when available, however the close time of the reciever still may or may not be long enough in that particular situation. CyberSync does not support any AF activation.
Once CC can trigger either of two cameras or both easily. In theory, in this set up, both cameras should be able to trigger one set of lights, especially if it is an either/or scenario for the cameras (i.e. you will not trigger both). If using both cameras, you should probably use two sets of lights. Even with two identical model cameras, the reaction time may vary, and you may get two pops of the flash, or a sync difference. CC to cameras should be on one frequency, camera to lights should be on a second frequency, and second camera to lights should be on a third.
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